docs: Update enterprise search templates for GA status

- Remove beta notices from README
- Standardize terminology to use "developer sandbox"
- Simplify manifest filter description for consistency

Co-Authored-By: Claude <svc-devxp-claude@slack-corp.com>

Author: WilliamBergamin

README.md

@@ -1,10 +1,8 @@
 # Bolt for Python Search Template
 
-> ⚠️ **Beta Notice**: This template demonstrates search functionality that is currently in beta and not yet widely available to all developers. The features shown here are being tested and may change before general availability.
-
 This is a Slack app template for building search functionality using Bolt for Python. It demonstrates how to create custom functions for search and filtering capabilities.
 
-It's recommended to use a [Slack sandbox](https://docs.slack.dev/tools/developer-sandboxes/) for development and testing. Other workspaces may not have access to all these features. To get started:
+It's recommended to use a [developer sandbox](https://docs.slack.dev/tools/developer-sandboxes/) for development and testing. Other workspaces may not have access to all these features. To get started:
 
 1. Join the [Slack Developer Program](https://api.slack.com/developer-program) if you haven't already
 2. [Provision a sandbox workspace](https://docs.slack.dev/tools/developer-sandboxes/#provision)

manifest.json

@@ -44,7 +44,7 @@
 	"functions": {
 		"filters": {
 			"title": "Sample filters",
-			"description": "The filter function is used to define the filters for search results",
+			"description": "Returns the filters for the search function",
 			"input_parameters": {
 				"user_context": {
 					"type": "slack#/types/user_context",